but he was in a very, very dangerous environment. take us behind the scenes. what do folks in government tell these humanitarian workers when they go out there, because obviously they know the danger is involved. >> well, of course, wolf. all americans are warned not to travel to various areas, especially like a war zone like iraq and afghanistan. thank you you encourage them to register with the embassy and let them know of their movement when traveling outside of secure areas and then there's not much you can do. when you're confronted with this sort of dilemma, it's always a calculation. you're always looking at, what is the u.s. national interest? here we have u.s. forces on the ground. we are trying to establish safe zones so that the afghan people can get back to some sort of a normal civilian life. so a calculation was made that it was in the u.s. national interest to try and rescue this doctor. but it really is -- when you see a tragedy like this, you understand, these calculations, these risks that you must assess and sort of balance can have tragic o